Date: Thu, 24 Jan 2002 14:12:52 +0200 From: Ruslan Ermilov <ru@FreeBSD.org> To: "Crist J. Clark" <cjc@FreeBSD.org> Cc: net@FreeBSD.org Subject: Re: sysctl(3) errnos wrong? Message-ID: <20020124141252.A38822@sunbay.com> In-Reply-To: <20020124022742.F87663@blossom.cjclark.org> References: <20020123025135.E83184@blossom.cjclark.org> <20020124115209.B16972@sunbay.com> <20020124022742.F87663@blossom.cjclark.org>
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On Thu, Jan 24, 2002 at 02:27:42AM -0800, Crist J. Clark wrote:
> On Thu, Jan 24, 2002 at 11:52:09AM +0200, Ruslan Ermilov wrote:
> > Sounds like that, but changing it now would be too backwards incompatible.
>
> Then shouldn't we fix the documentation to reflect reality?
>
Hmm, I've looked at the OpenBSD and NetBSD code but didn't look at
the BSD/OS code before. BSD/OS has fixed the issue exactly as you
suggest. I withdraw my objection. Please commit this patch:
Index: rtsock.c
===================================================================
RCS file: /home/ncvs/src/sys/net/rtsock.c,v
retrieving revision 1.64
diff -u -p -r1.64 rtsock.c
--- rtsock.c 2002/01/18 14:33:03 1.64
+++ rtsock.c 2002/01/24 12:11:30
@@ -1008,7 +1008,7 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS)
if (req->newptr)
return (EPERM);
if (namelen != 3)
- return (EINVAL);
+ return ((namelen < 3) ? EISDIR : ENOTDIR);
af = name[0];
Bzero(&w, sizeof(w));
w.w_op = name[1];
> > On Wed, Jan 23, 2002 at 02:51:35AM -0800, Crist J . Clark wrote:
> > > Here is a quick, broken, program,
> > >
> > > #include <sys/types.h>
> > > #include <sys/sysctl.h>
> > > #include <sys/time.h>
> > > #include <sys/socket.h>
> > > #include <net/if.h>
> > > #include <net/route.h>
> > >
> > > #include <sysexits.h>
> > >
> > > /* #define MIB_LEN 6 */
> > > #define MIB_LEN 5
> > >
> > > int main(int argc, char *argv[])
> > > {
> > > int mib[MIB_LEN];
> > > size_t rttsize;
> > >
> > > mib[0] = CTL_NET;
> > > mib[1] = PF_ROUTE;
> > > mib[2] = 0;
> > > mib[3] = AF_INET;
> > > mib[4] = NET_RT_DUMP;
> > > /* mib[5] = 0; */
> > >
> > > if (sysctl(mib, MIB_LEN, NULL, &rttsize, NULL, 0) != 0)
> > > err(EX_OSERR, "sysctl(3) for table size failed");
> > >
> > > return 0;
> > > }
> > >
> > > This broken version will return,
> > >
> > > $ ./sysctlerr
> > > sysctlerr: sysctl(3) for table size failed: Invalid argument
> > >
> > > However, if we look at the errno descriptions in the sysctl(3)
> > > manpage, an EINVAL is returned when,
> > >
> > > [EINVAL] The name array is less than two or greater than
> > > CTL_MAXNAME.
> > >
> > > [EINVAL] A non-null newp is given and its specified length in
> > > newlen is too large or too small.
> > >
> > > Neither of which is the case here. I think it should be returning one
> > > of these,
> > >
> > > [ENOTDIR] The name array specifies an intermediate rather than
> > > terminal name.
> > >
> > > [EISDIR] The name array specifies a terminal name, but the
> > > actual name is not terminal.
> > >
> > > But "terminal" or "intermediate" names are not defined anywhere else
> > > in the manpage.
Cheers,
--
Ruslan Ermilov Oracle Developer/DBA,
ru@sunbay.com Sunbay Software AG,
ru@FreeBSD.org FreeBSD committer,
+380.652.512.251 Simferopol, Ukraine
http://www.FreeBSD.org The Power To Serve
http://www.oracle.com Enabling The Information Age
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